You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it Instead, your roommate plays video games for hours. When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry w-ill not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find that the equilibrium temperature is a nice, warm 38.3 ℃. You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 ℃. The pastry has amass of 0.16 kg and a specific heat of 3.0 k J/(kg . ℃), and is at a uniform initial temperature of 4.0 ℃. The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg . ℃). What is the specific heat of the console?
You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it Instead, your roommate plays video games for hours. When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry w-ill not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find that the equilibrium temperature is a nice, warm 38.3 ℃. You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 ℃. The pastry has amass of 0.16 kg and a specific heat of 3.0 k J/(kg . ℃), and is at a uniform initial temperature of 4.0 ℃. The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg . ℃). What is the specific heat of the console?
You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it Instead, your roommate plays video games for hours. When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry w-ill not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find that the equilibrium temperature is a nice, warm 38.3 ℃. You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 ℃. The pastry has amass of 0.16 kg and a specific heat of 3.0 k J/(kg . ℃), and is at a uniform initial temperature of 4.0 ℃. The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg . ℃). What is the specific heat of the console?
To help keep his barn warm on cold days, a farmer stores 860 kg of solar-heated water (Lf = 3.35E+5 J/kg) in barrels. For how many hours would a 1.89 kW electric space heater have to operate to provide the same amount of heat as the water does, when it cools from 11.8 to 0∘∘C and completely freezes?
Consider a room that is initially at the outdoor temperature of 20°C. The room contains a 40-W lightbulb, a 110-W TV set, a 300-W refrigerator, and a 1200-W iron. Assuming no heat transfer through the walls, determine the rate of increase of the energy content of the room when all of these electric devices are on.
Consider a room that is initially at the outdoor temperature of 20 C. The room contains a 60-W light bulb, a 3000-W electric oven, a 400-W TV set and two 300-W fridge. Assuming no heat transfer through the walls, determine the rate of increase of the energy content of the room when all of these electric devices are on.
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